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/usr/lib/refractasnapshot/efi-image.sh: 73: /usr/lib/refractasnapshot/efi-image.sh: mkfs.msdos: not found
The error indicates that efi-image.sh didn't work, because mkfs.msdos is missing. If you install dosfstools, the script will create efi.img.
At what point did you copy the debian efi.img to your iso directory? If you added it when the script pauses to let you edit the boot menu, your efi.img may have been wiped out, because the efi stuff happens after the pause. That may need to change.
I tried copying the /boot folder from a debian-testing CD-1 and the /live folder from a jessie-sysv amd64 iso to a directory and then rolled it into an iso image. It booted to grub command line in vbox set to efi mode. I played around on the command line trying to get it to boot, but I didn't succeed. At first, I got messages like "linux: command not found".
Problem was that a lot (or all) of the grub modules were not loaded. Spent some time loading them manually, but it still wouldn't work, because it couldn't find a suitable video mode. On top of that, I'm having network problems today, and I can't seem to transfer files between VM and host.